Cited by 48Antibiotic Resistance in BacteriaSalmonella and Campylobacter epidemiologyFood Safety and Hygiene

Hygiene quality and presence of ESBL-producing Escherichia coli in raw food diets for dogs

Open access
Nilsson, Oskar·2015·Infection Ecology & Epidemiology

Abstract

BACKGROUND: Raw food diets are popular among some dog owners, even though there are concerns regarding the infectious disease risk and public health implications. Hence, the two aims of this study were to investigate the hygiene quality of raw food diets for dogs in the Swedish market and if Escherichia coli with transferable resistance to extended spectrum cephalosporins (ESC) was present in such products. METHODS: Samples of raw food diets were suspended and further diluted in 0.9% saline. Appropriate dilutions were 1) cultured on Petrifilm™SEC to quantify the amount of E. coli in the samples and 2) mixed with cefotaxime to a final concentration of 1 mg/L and cultured on Petrifilm™SEC to quantify the amount of ESC-resistant E. coli in the samples. Furthermore, undiluted suspensions were mixed 1:1 with double strength MacConkey broth with cefotaxime, enriched overnight and finally cultured on MacConkey agar with cefotaxime (1 mg/L). Suspected ESC-resistant E. coli were screened by PCR for genes encoding extended spectrum beta lactamases and plasmid-mediated AmpC and their susceptibility to a panel of antimicrobials was performed by broth microdilution using VetMIC GN-mo. RESULTS: Escherichia coli was isolated from all samples (n=39) and ESC-resistant E. coli was isolated from nine samples (23%). All ESC-resistant E. coli were PCR-positive for the bla CMY-2 group and only one of them was also resistant to a non-beta-lactam antibiotic. CONCLUSION: The results of this study indicate that raw food diets could be a source of ESC-resistant E. coli to dogs and highlight the need for maintaining good hygiene when handling these products to prevent infection.

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  • Numbers of E. coli in frozen raw pet food exceed the EU absolute threshold (5×10^3 cfu/g) for raw pet food at the point of production.

    “and also exceed the EU absolute threshold (5×103 cfu/g; Commission Regulation (EU) No 142/2011) for raw pet food at the point of production (Nilsson 2015, van Bree et al. 2018)”

    From Raw diets for dogs and cats: a review, with particular reference to microbiological hazards. (2019) · cites this paper as Nilsson 2015

    The Results report that 2 of 39 raw dog-food samples contained more than 5×10⁴ CFU/g of E. coli, so those samples necessarily exceeded 5×10³ CFU/g. But the Discussion compares them with a different Swedish limit; the paper does not identify the cited EU threshold or establish that the samples exceeded it at the point of production. The samples were purchased from shops, as described in Materials and methods; page numbers are unavailable in our copy. (LLM, conf=0.88)

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  • Numbers of E. coli in frozen raw pet food commonly exceed EU limits for minced meat destined for human consumption, sometimes by two or more orders of magnitude.

    “Numbers of E. coli in frozen raw pet food commonly exceed EU limits for minced meat destined for human consumption, sometimes by two or more orders of magnitude”
  • 23% of Nordic raw food samples containing poultry meat yielded plasmid-borne AmpC genes.

    “whilst 23% of Nordic raw food samples containing poultry meat yielded plasmid‐borne AmpC genes (Nilsson 2015).”

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10 of the 23 references couldn’t be matched to a known paper.

Research works printed but not linked: 5

  1. [2]Schlesinger DP Joffe DJ Raw food diets in companion animals: a critical review Can Vet J 2011 52 50 4 21461207 PMC3003575
  2. [5]Weese JS Rousseau J Arroyo L Bacteriological evaluation of commercial canine and feline raw diets Can Vet J 2005 46 513 16 16048011 PMC1140397
  3. [7]Joffe DJ Schlesinger DP Preliminary assessment of the risk of Salmonella infection in dogs fed raw chicken diets Can Vet J 2002 43 441 2 12058569 PMC339295
  4. [12]Case LP Daristotle L Hayek MG Raasch MR Case LP Daristotle L Hayek MG Raasch MR Nutrient content of pet food Canine and feline nutrition: a resource for companion animal professionals 2011 3rd ed Maryland Heights, MO Mosby 141 62
  5. [13]Ewers C Grobbel M Bethe A Wieler LH Guenther S Extended-spectrum beta-lactamases-producing gram-negative bacteria in companion animals: action is clearly warranted! Berl Munch Tierarztl Wochenschr 2011 124 94 101 21462862

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Authors
Nilsson, O.
Affiliations
Swedish Veterinary Agency (SE)
Corresponding author
Nilsson, Oskar
Venue
Infection Ecology & Epidemiology
Published
2015-01
Volume
5
Issue
1
Pages
28758
ISSN
2000-8686 (ISSN-L)
OpenAlex
W2136397294
Cited by
43
References
23
Citations by year
2026: 2 · 2025: 3 · 2024: 4 · 2023: 1 · 2022: 4 · 2021: 5 · 2020: 11 · 2019: 5 · 2018: 3 · 2017: 4 · 2016: 1
FWCI
1.11
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • Infection Ecology & Epidemiology (publishedVersion)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Statens Jordbrugs- og Veterinærvidenskabelige Forskningsråd
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Medicine › Antibiotic Resistance in Bacteria
  • Life Sciences › Agricultural and Biological Sciences › Food Science › Salmonella and Campylobacter epidemiology
  • Life Sciences › Agricultural and Biological Sciences › Food Science › Food Safety and Hygiene
Keywords
raw food diet, dogs, Escherichia coli, extended-spectrum beta-lactamase, antimicrobial resistance, pet food, blaCMY-2, plasmid-mediated AmpC, cefotaxime, public health risk

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